Text-book of ophthalmology . [Fig. 5.—Priestley Smiths Keratometer. (After Posey and Spiller.) This consists of a lens containing a millimetre scale, B, B. If the observer places his eye at thefocus of the lens, A, and looks through it it any object, as the cornea or iris, C, the size of the latter willbe given accurately by the Dumber of divisions that the object appears to cover on the scale.—D.] same time we notice whether the iris quivers as the eye makes a suddenmovement. Then we determine whether the pupil is round, whether itswidth is normal and equal to that of the ol her eye. (If the
Text-book of ophthalmology . [Fig. 5.—Priestley Smiths Keratometer. (After Posey and Spiller.) This consists of a lens containing a millimetre scale, B, B. If the observer places his eye at thefocus of the lens, A, and looks through it it any object, as the cornea or iris, C, the size of the latter willbe given accurately by the Dumber of divisions that the object appears to cover on the scale.—D.] same time we notice whether the iris quivers as the eye makes a suddenmovement. Then we determine whether the pupil is round, whether itswidth is normal and equal to that of the ol her eye. (If the pupil is of abnor-mal size we do not neglect to inquire whether possibly some drug has beenput into the eve which lias caused an artificial alteration of the pupil.)Moreover, we see whether the pupil is centrally placed and of a clear black. [The bed way to measure the Wtdih of the pupil is with the Priestley Smith kera-tometer (Pig. 5), which, as its name implies, is also used to measure the cornea. Forthis may he subst
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